Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3beab798f771c5e…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 23:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aecf4bdbf2f529291c944514f6d4b0f SHA-1: ebd67be6749010579c71aefa0e796c8a28dc59d0 SHA-256: a3beab798f771c5e8238ebbcd8645cc330b6ca12828e92502feca65c8b6226ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kindergartenhelden.at/upload/file/nuvifonowe.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2cdfb3bade04a3723812da7c1706c14c/15772798772.pdf
    • http://pressvaluation.net/userfiles/file/votodigumudiloma.pdf
    • https://daynexweb.com/upload/ckfinder/files/51509914059.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/rovem.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8839b64e---29615182584.pdf
    • https://kodcomputers.ro/2664/uploads/70932614172.pdf
    • https://timminsrenovations.ca/file/SPofy5qm4C39Szce.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731b828f2f0---sulowilibofosam.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/5216633130.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/56016883561.pdf
    • http://schokoladenbrunnen.de/idata/pupolubutaf.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/912f75d4470ce605d754e7240597e83e/48798664383.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/21756d0e49a7ac0184347c1a06fcf56d/34697467200.pdf
    • https://agermag.ro/mm/file/291694073.pdf
    • http://onnetsolution.in/userfiles/file/44665084207.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/rusulapijatuzulasefelaze.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/ruwawepaxewulisalirere.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5125847d3bc22d508dc81f25301e4314/48497604190.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e37c03b75---subeto.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cgu378t9h9qdfid6t9ulpt7cpj/kotekutolenotamifumiv.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ead237017---jegegovojirevinos.pdf
    • http://zuche0551.com/upload/file/31576419239.pdf
    • https://kermoulin.com/userfiles/file/34548742717.pdf
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/nafesepiwanumegokataduxab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=outlook+mail+to+pdf+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16792 bytes
font_01_sfnt_off000102df.bin
604bd0bfb6de1779b6021b8220fb1a0a2c69d4bdeffd660ef0542380f5b1aeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10896 bytes
font_02_sfnt_off00011c15.bin
082351185ae40e5c417631a2eb62fae37d1421d9beb0871e8d8c45846359196b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 18512 bytes